package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.xiaoymin.knife4j.core.util.CollectionUtils;
import com.sky.constant.MessageConstant;
import com.sky.constant.WebSocketConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.*;
import java.util.stream.Collectors;

import com.sky.websocket.WebSocketServer;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WebSocketServer webSocketServer;


    /*
    * 用户下单
    * */
    @Override
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        //处理业务异常（1、用户地址表为空 2、用户购物车为空）
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if(addressBook == null){
            //地址为空，抛出异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //查询用户购物车信息
        Long userId = BaseContext.getCurrentId();

        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        if(shoppingCartList == null || shoppingCartList.isEmpty()){
            //用户购物车内无商品，抛出异常
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //向订单表中插入数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);

        orderMapper.insert(orders);

        List<OrderDetail> orderDetailList = new ArrayList<>();
        //向订单明细表中插入数据
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart,orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }

        orderDetailMapper.insertBatch(orderDetailList);

        //清空当前用户购物车数据
        shoppingCartMapper.deleteByUserId(userId);

        //封装对象并返回
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

//        //调用微信支付接口，生成预支付交易单
//        JSONObject jsonObject = weChatPayUtil.pay(
//            ordersPaymentDTO.getOrderNumber(), //商户订单号
//            new BigDecimal(0.01), //支付金额，单位 元
//            "苍穹外卖订单", //商品描述
//            user.getOpenid() //微信用户的openid
//        );
        // TODO: 2025/04/04 暂时跳过微信支付接口，直接生成预支付交易单,并直接执行支付成功操作
        JSONObject jsonObject = new JSONObject();//由于个人微信支付接口未开通，所以直接跳过微信支付接口
        paySuccess(ordersPaymentDTO.getOrderNumber());



        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        //通过webSocket向客户端推送接单消息
        Map map = new HashMap(){{
            put("type", WebSocketConstant.NEW_ORDER_TYPE);
            put("orderId", ordersDB.getId());
            put("content", "您有新的订单,请及时处理,"+"订单号: "+outTradeNo);
        }};
        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /*
    * 用户端订单分页查询
    * */
    @Override
    public PageResult pageQueryUser(int pageNum, int pageSize, Integer status) {
        //设置分页
        PageHelper.startPage(pageNum,pageSize);

        //设置查询条件
        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        //分页查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();
        //查询订单明细,封装到orderVO中返回结果
        if (page != null && page.getTotal() > 0){
            for (Orders orders : page) {
                //获取订单id便于查询订单明细
                Long ordersId = orders.getId();

                List<OrderDetail> orderDetailList =
                        orderDetailMapper.getByOrderId(ordersId);

                //封装结果
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);
                orderVO.setOrderDetailList(orderDetailList);

                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(),list);
    }

    /*
    * 查询订单详情
    * */
    @Override
    public OrderVO details(Long id) {
        // 根据id查询订单
        Orders orders = orderMapper.getById(id);

        // 查询该订单对应的菜品/套餐明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将该订单及其详情封装到OrderVO并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;
    }

    /*
    * 取消订单
    * */
    @Override
    public void userCancelById(Long id) throws Exception {
        //根据id查询订单信息
        Orders ordersDB = orderMapper.getById(id);

        //校验订单是否存在，不存在直接抛出异常
        if (ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //订单存在，查询订单的状态
        if (ordersDB.getStatus() > 2){
            //订单状态值大于二，不能直接取消订单，抛出异常
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());

        //订单已支付且可以直接取消，进行微信退款操作
        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            //调用微信支付退款接口 TODO 2025/04/08 没有商户号，退款操作无法完成
           /* weChatPayUtil.refund(
                    ordersDB.getNumber(), //商户订单号
                    ordersDB.getNumber(), //商户退款单号
                    new BigDecimal("0.01"),//退款金额，单位 元
                    new BigDecimal("0.01"));//原订单金额*/

            //支付状态修改为 退款
            orders.setPayStatus(Orders.REFUND);
        }

        // 更新订单状态、取消原因、取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);

    }

    /*
    * 再来一单
    * */
    @Override
    public void repetition(Long id) {

        //根据订单id查询订单明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        //获取用户id
        Long userId = BaseContext.getCurrentId();

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);

    }

    /*
    * 订单搜索
    * */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        //开始分页查询
        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);
    }

    /*
    * 各个状态的订单数量统计
    * */
    @Override
    public OrderStatisticsVO statistics() {
        // 根据状态，分别查询出待接单、待派送、派送中的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        // 将查询出的数据封装到orderStatisticsVO中响应
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        return orderStatisticsVO;
    }

    /*
    * 接单
    * */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /*
    * 拒单
    * */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        //查询订单状态
        Orders orderDB = orderMapper.getById(ordersRejectionDTO.getId());

        //若订单状态为待接单才可拒单，其他状态均不可拒单
        if (orderDB == null || !orderDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //查询订单的支付状态
        Integer payStatus = orderDB.getPayStatus();
        //若订单已被支付，则需要完成退款操作
        if (Objects.equals(payStatus, Orders.PAID)){
            //TODO 2025/04/10 没有商业号暂时无法完成退款操作
            log.info("完成退款操作");
        }

        //根据订单id更新订单状态 拒单原因 取消时间
        Orders orders = Orders.builder()
                .id(orderDB.getId())
                .status(Orders.CANCELLED)
                .rejectionReason(ordersRejectionDTO.getRejectionReason())
                .cancelTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);
    }

    /*
    * 管理端取消订单
    * */
    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        //通过订单id查询订单详情
        Orders orderDB = orderMapper.getById(ordersCancelDTO.getId());

        //查询支付状态
        Integer payStatus = orderDB.getPayStatus();
        //若订单已被支付，则需要完成退款操作
        if (Objects.equals(payStatus, Orders.PAID)){
            //TODO 2025/04/10 没有商业号暂时无法完成退款操作
            log.info("完成退款操作");
        }

        //更新当前订单的订单状态 取消原因 取消时间
        Orders orders = Orders.builder()
                .id(orderDB.getId())
                .status(Orders.CANCELLED)
                .cancelReason(ordersCancelDTO.getCancelReason())
                .cancelTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);
    }

    /*
    * 派送订单
    * */
    @Override
    public void delivery(Long id) {
        //根据id查询订单详情
        Orders orderDB = orderMapper.getById(id);

        //只有订单状态为待派送且订单存在才可派送订单
        if (orderDB == null || !orderDB.getStatus().equals(Orders.CONFIRMED)){
            //此时无法进行派送操作，抛出异常
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //修改订单状态为派送中
        Orders orders = Orders.builder()
                .id(orderDB.getId())
                .status(Orders.DELIVERY_IN_PROGRESS)
                .build();

        orderMapper.update(orders);
    }

    /*
    * 完成订单
    * */
    @Override
    public void complete(Long id) {
        //根据id查询订单详情
        Orders orderDB = orderMapper.getById(id);

        //查看订单状态，只有订单状态为派送中且不为空时才可完成订单
        if (orderDB == null || !orderDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)){
            //此时的订单状态不允许完成订单
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //修改订单状态为完成订单
        Orders orders = Orders.builder()
                .id(orderDB.getId())
                .status(Orders.COMPLETED)
                .deliveryTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

    }

    /*
    * 用户催单
    * */
    @Override
    public void reminder(Long id) {
        //从数据库中查询到订单信息
        Orders ordersDB = orderMapper.getById(id);

        //判断订单状态若为空则抛出异常
        if (ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //向前端发送数据
        Map map = new HashMap();
        map.put("type",2);
        map.put("orderId",id);
        map.put("content",ordersDB.getNumber());

        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }

    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /*
    * 根据订单id获取菜品信息字符串
    * */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }

}
